Re: Specify variable type for range of associative arrays.

[via Digitalmars-d-learn]

On Sunday, 9 August 2015 at 14:23:33 UTC, Chris Davies wrote:

The problem is, based on user input, I am optionally filtering a list, possibly passing it through 0, 1, 2 or more filters based on their input. Each successive filter runs on either the original range or the result of the previous filter, if there was one. Then I want to run a ussr-specified computation on the final range... So it would be very nice to be able to reassign the variable after each filter. Is there no good way to do that other than with Generator?

You can use InputRange:
http://dlang.org/phobos/std_range_interfaces.html#InputRange

e.g.

    auto input = yourOriginalData.map!someTransformation;
    InputRange!string range;
    if(where != "")
        range = inputRangeObject(input.filter!(s => s == where));
    else
        range = inputRange(input);